I put a 97 model 5.9 magnum in my 1985 crew with NP435. my motor was originally mated to an auto so i had to add a pilot bearing in the crank. I used a stock 97 flywheel with a clutch disk for the 85. no issues. recently pulled it in favor of an A518 swap


1985 Crew Cab W250 4x4 - daily driver, 5.9 magnum, carbed and distributor, A-518 and NP205
2002 3500 extended cab, 4x4, Cummins and 6 speed
1997 Ram 2500 5.9 with 35 Boggers - Mud Racer
1993 Dakota 4x4, Dana 60's front and rear - work in progress
1992 Dakota 2wd short bed, awaiting 440 swap